Display Device

ABSTRACT

A display device is provided, which may improve camera image quality. The display device comprises a display panel including a first display area and a second display area in which a plurality of transmissive areas are disposed, a roller portion coupled to the display panel at one side of the display panel, moving the display panel, an optical sensor disposed to overlap the second display area of the display panel, and a driving controller controlling the roller portion to rotate forward or backward based on an operation of the optical sensor.

CROSS-REFERENCE TO RELATED APPLICATIONS

This patent application claims priority under 35 U.S.C. § 119(a) fromRepublic of Korea Patent Application No. 10-2021-0192777 filed on Dec.30, 2021, which is incorporated herein by reference in its entirety.

BACKGROUND Field of the Invention

The present disclosure relates to a display device provided with anoptical sensor.

Description of the Related Art

A display device includes various display elements, such as a liquidcrystal display element or an organic light emitting element, in adisplay area. The display device has been devised to apply variousapplications by embedding a camera therein to link the display area tothe camera.

In the display device, the camera may be disposed below a display panel.In this way, the display device embedded with a camera may not displayan image on an area overlapped with the camera, and in this case, theimage displayed on the display device may be disconnected and recognizedby a user. Meanwhile, when a plurality of pixels are disposed to displaythe image on the area overlapped with the camera, light transmittancemay be reduced due to the arrangement of the plurality of pixels overthe camera, whereby quality of a camera image may be deteriorated.

SUMMARY

The present disclosure has been made in view of the above problems andit is an object of the present disclosure to provide a display devicethat may display an image even on an area overlapped with an opticalsensor.

It is another object of the present disclosure to provide a displaydevice that may improve image quality of an optical sensor.

In addition to the objects of the present disclosure as mentioned above,additional objects and features of the present disclosure will beclearly understood by those skilled in the art from the followingdescription of the present disclosure.

In accordance with an aspect of the present disclosure, the above andother objects can be accomplished by the provision of a display devicecomprising a display panel including a first display area and a seconddisplay area in which a plurality of transmissive areas are disposed, aroller portion coupled to the display panel at one side of the displaypanel, moving the display panel, an optical sensor disposed to overlapthe second display area of the display panel, and a driving controllercontrolling the roller portion to rotate forward or backward based on anoperation of the optical sensor.

In accordance with another aspect of the present disclosure, the aboveand other objects can be accomplished by the provision of a displaydevice comprising an optical sensor acquiring a first frame image and asecond frame image continuously in accordance with an operation signal,and a display panel including a first display area and a second displayarea overlapped with the optical sensor, in which a plurality oftransmissive areas are disposed. The display panel has differentpositions overlapped with the optical sensor at a photographing timingof the first frame image and a photographing timing of the second frameimage.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other objects, features and other advantages of thepresent disclosure will be more clearly understood from the followingdetailed description taken in conjunction with the accompanyingdrawings, in which:

FIG. 1 is a schematic plan view illustrating a display device accordingto one embodiment of the present disclosure;

FIG. 2 is a schematic exploded view illustrating a display deviceaccording to one embodiment of the present disclosure;

FIG. 3 is a schematic plan view illustrating subpixels disposed in adisplay panel according to one embodiment of the present disclosure;

FIG. 4 is a cross-sectional view illustrating an example of I-I′ of FIG.3 ;

FIG. 5 is a cross-sectional view illustrating an example of II-II′ ofFIG. 3 ;

FIG. 6 is a schematic block view illustrating elements of a displaydevice according to one embodiment of the present disclosure;

FIG. 7 is a schematic view illustrating an example of a plurality oftransmissive areas disposed in an area overlapped with an optical sensorat a photographing timing of a first frame image;

FIG. 8 is a schematic view illustrating an example of a plurality oftransmissive areas disposed in an area overlapped with an optical sensorat a photographing timing of a second frame image;

FIG. 9 is a view illustrating an example in which a plurality of frameimages are synthesized when a photographing period of an optical sensorand a rotational period of a roller are the same as each other;

FIG. 10 is a view illustrating an example in which a plurality of frameimages are synthesized when a photographing period of an optical sensorand a rotational period of a roller are different from each other;

FIG. 11 is a view illustrating an example of an image displayed on adisplay panel when the display panel moves upward or downward; and

FIG. 12 is a timing view illustrating a timing of a gate start signalwhen a display panel moves upward or downward.

DETAILED DESCRIPTION OF THE DISCLOSURE

Advantages and features of the present disclosure, and implementationmethods thereof will be clarified through following embodimentsdescribed with reference to the accompanying drawings. The presentdisclosure may, however, be embodied in different forms and should notbe construed as limited to the embodiments set forth herein. Rather,these embodiments are provided so that this disclosure will be thoroughand complete, and will fully convey the scope of the present disclosureto those skilled in the art. Further, the present disclosure is onlydefined by scopes of claims.

A shape, a size, a ratio, an angle, and a number disclosed in thedrawings for describing embodiments of the present disclosure are merelyan example, and thus, the present disclosure is not limited to theillustrated details. Like reference numerals refer to like elementsthroughout the specification. In the following description, when thedetailed description of the relevant known function or configuration isdetermined to unnecessarily obscure the important point of the presentdisclosure, the detailed description will be omitted. In a case where‘comprise’, ‘have’, and ‘include’ described in the present specificationare used, another part may be added unless ‘only˜’ is used. The terms ofa singular form may include plural forms unless referred to thecontrary.

In construing an element, the element is construed as including an errorrange although there is no explicit description.

In describing a position relationship, for example, when the positionrelationship is described as ‘upon˜’, ‘above˜’, ‘below˜’, and ‘nextto˜’, one or more portions may be arranged between two other portionsunless ‘just’ or ‘direct’ is used.

It will be understood that, although the terms “first”, “second”, etc.may be used herein to describe various elements, these elements shouldnot be limited by these terms. These terms are only used to distinguishone element from another. For example, a first element could be termed asecond element, and, similarly, a second element could be termed a firstelement, without departing from the scope of the present disclosure.

In describing elements of the present disclosure, the terms “first”,“second”, etc. may be used. These terms are intended to identify thecorresponding elements from the other elements, and basis, order, ornumber of the corresponding elements are not limited by these terms. Theexpression that an element is “connected” or “coupled” to anotherelement should be understood that the element may directly be connectedor coupled to another element but may directly be connected or coupledto another element unless specially mentioned, or a third element may beinterposed between the corresponding elements.

Features of various embodiments of the present disclosure may bepartially or overall coupled to or combined with each other, and may bevariously inter-operated with each other and driven technically as thoseskilled in the art can sufficiently understand. The embodiments of thepresent disclosure may be carried out independently from each other, ormay be carried out together in co-dependent relationship.

FIG. 1 is a schematic plan view illustrating a display device accordingto one embodiment of the present disclosure, and FIG. 2 is a schematicexploded view illustrating a display device according to one embodimentof the present disclosure.

Referring to FIGS. 1 and 2 , a display device 10 according to oneembodiment of the present disclosure may include a display panel 100, aroller portion 200, an optical sensor 300, a circuit board 400, a coverwindow 500 and a frame 600.

The display panel 100 may be categorized into a display area DA in whichpixels are formed to display an image and a non-display area NDA inwhich an image is not displayed.

The non-display area NDA may be disposed to surround the display areaDA. The non-display area NDA may include a driver for supplying varioussignals to a plurality of signal lines in the display area DA and a linkportion for connecting the driver with the plurality of signal lines.The driver may include a gate driver for supplying a gate signal to agate line and a data driver for supplying a data signal to a data line.

Although the display panel 100 is described as being implemented as anorganic light emitting display device, it may be also implemented as aliquid crystal display device, a plasma display panel (PDP), a quantumdot light emitting display (QLED) device or an electrophoretic displaydevice.

The roller portion 200 may be coupled to the display panel 100 at oneside of the display panel 100. For example, the roller portion 200 maybe disposed on an upper side of the display panel 100 as shown in FIG. 2. The roller portion 200 may include a roller that is rotatable, aroller module connected to the roller to forward or backward rotate theroller, and a coupling unit for coupling the roller to one side of thedisplay panel 100. The roller portion 200 may move the display panel 100in a predetermined direction while rotating the roller forward orbackward. For example, when the roller rotates forward, the displaypanel 100 may move upward while winding. On the other hand, when theroller rotates backward, the display panel 100 may move downward whileunwinding.

The optical sensor 300 may be disposed over a rear surface of thedisplay panel 100. The optical sensor 300 may be provided to overlap thedisplay area DA of the display panel 100, particularly a second displayarea DA2 as shown in FIG. 3 . The optical sensor 300 may mean allelements that measure external light input through the display panel 100to use the measured external light. For example, the optical sensor 300may be a camera, but is not limited thereto. The optical sensor 300 maybe an infrared sensor, an illuminance sensor, a fingerprint sensor orthe like.

The circuit board 400 may be disposed over the rear surface of thedisplay panel 100. The circuit board 400 may be a printed circuit board(PCB) or a flexible printed circuit board (FPCB).

The cover window 500 may be disposed over a front surface of the displaypanel 100. The cover window 500 may protect the display panel 100 fromexternal impact by covering the front surface of the display panel 100.

The cover window 500 may be made of a transparent plastic material, aglass material or a reinforced glass material. As an example, the coverwindow 500 may have any one of a stacked structure of sapphire glass andgorilla glass. As another example, the cover window 500 may include anyone of polyethyleneterephthalate (PET), polycarbonate (PC),polyethersulfone (PES), polyethylenapthanate (PEN) and polynorbornene(PNB). The cover window 500 may be made of reinforced glass inconsideration of scratch and transparency.

The frame 600 may accommodate the display panel 100 and support thecover window 500. The frame 600 may include an accommodating portionthat may accommodate the roller portion 200, the optical sensor 300 andthe circuit board 400. The frame 600 allows the display panel 100, theroller portion 200, the optical sensor 300 and the circuit board 400 tobe fixed to the display device 10. The frame 600 may serve to protectthe display panel 100, the roller portion 200, the optical sensor 300and the circuit board 400 from impact. The frame 600 may be a middleframe or a housing, but is not limited thereto.

Hereinafter, subpixels disposed in a first display area DA1 and thesecond display area DA2 of the display panel 100 will be described indetail.

FIG. 3 is a schematic plan view illustrating subpixels disposed in adisplay panel according to one embodiment of the present disclosure,FIG. 4 is a cross-sectional view illustrating an example of I-I′ of FIG.3 , and FIG. 5 is a cross-sectional view illustrating an example ofII-II′ of FIG. 3 .

Referring to FIGS. 3 to 5 , the display panel 100 includes a firstdisplay area DA1 and a second display area DA2. A plurality of firstpixels FP may be disposed in the first display area DAL The plurality offirst pixels FP emit predetermined light to display an image. A lightemission area EA may correspond to an area, which emits light, in thefirst pixel FP.

Each of the plurality of first pixels FP may include a plurality offirst subpixels FSP. The plurality of first subpixels FSP may include afirst color subpixel FSP1, a second color subpixel FSP2 and a thirdcolor subpixel FSP3. The first color subpixel FSP1 may emit red light,the second color subpixel FSP2 may emit green light and the third colorsubpixel FSP3 may emit blue light, but they are not limited thereto.Each of the first pixels FP may further include a fourth color subpixelFSP4 that emits white light. Various modifications may be made in thearrangement order of the first subpixels FSP without limitation to thatshown in FIG. 3 .

A circuit element, which includes a capacitor, a thin film transistorand the like, and a light emitting element may be provided in each ofthe first subpixel FSP1, the second subpixel FSP2 and the third subpixelFSP3. The thin film transistor may include a switching transistor, asensing transistor, and a driving transistor T.

The switching transistor may be switched in accordance with a scansignal supplied to a scan line to supply a data voltage supplied from adata line to the driving transistor T.

The sensing transistor serves to sense a threshold voltage deviation ofthe driving transistor T, which causes deterioration of image quality.

The driving transistor T is switched in accordance with the data voltagesupplied from the switching transistor to generate a data current from apower source supplied from a pixel power line, thereby supplying thedata current to a first electrode 120 of the subpixels FSP1, FSP2, FSP3and FSP4.

The driving transistor T includes an active layer ACT, a gate electrodeGE, a source electrode SE and a drain electrode DE.

In detail, a light shielding layer LS may be provided over a firstsubstrate 111. The light shielding layer LS may shield external lightincident on the active layer ACT of the driving transistor T.

A buffer film BF may be provided over the light shielding layer LS. Thebuffer film BF may protect the transistors T from moisture permeatedthrough the first substrate 111 vulnerable to moisture permeation. Theactive layer ACT may be provided over the buffer film BF. The activelayer ACT may include a silicon-based semiconductor material or anoxide-based semiconductor material.

A gate insulating layer GI may be provided over the active layer ACT. Agate electrode GE may be provided over the gate insulating layer GI. Afirst interlayer dielectric layer ILD1 and a second interlayerdielectric layer ILD2 may be provided over the gate electrode GE.

A source electrode SE and a drain electrode DE may be provided over thesecond interlayer dielectric layer ILD2. One of the source electrode SEand the drain electrode DE may be connected to the active layer ACTthrough a first contact hole CH1 that passes through the gate insulatinglayer GI and the first and second interlayer dielectric layers ILD1 andILD2.

A first planarization layer PLN1 may be provided over the sourceelectrode SE and the drain electrode DE to planarize a step differencedue to the driving transistor T. An auxiliary electrode 115 may beprovided over the first planarization layer PLN1. The auxiliaryelectrode 115 may be connected to one of the source electrode SE and thedrain electrode DE through a second contact hole CH2 that passes throughthe first planarization layer PLN1. A second planarization layer PLN2may be provided over the auxiliary electrode 115.

Light emitting elements, which include a first electrode 120, an organiclight emitting layer 130 and a second electrode 140, and a bank 125 areprovided over the second planarization layer PLN2.

The first electrode 120 may be provided over the second planarizationlayer PLN2 for each of the subpixels FSP1, FSP2, FSP3 and FSP4. Thefirst electrode 120 may be connected to the driving transistor T. Indetail, the first electrode 120 may be connected to the auxiliaryelectrode 115 through a third contact hole CH3 that passes through thesecond planarization layer PLN2. Since the auxiliary electrode 115 isconnected to the source electrode SE or the drain electrode DE of thedriving transistor T through the second contact hole CH2, the firstelectrode 120 may be electrically connected to the driving transistor T.

The first electrode 120 may include a metal material having highreflectance, such as a stacked structure (Ti/Al/Ti) of aluminum andtitanium, a stacked structure (ITO/Al/ITO) of aluminum and ITO, an Agalloy, a stacked structure (ITO/Ag alloy/ITO) of Ag alloy and ITO, aMoTi alloy, and a stacked structure (ITO/MoTi alloy/ITO) of MoTi alloyand ITO. The Ag alloy may be an alloy of silver (Ag), palladium (Pd),copper (Cu), etc. The MoTi alloy may be an alloy of molybdenum (Mo) andtitanium (Ti). The first electrode 120 may be an anode electrode of thelight emitting element.

The bank 125 may be provided over the second planarization layer PLN2.The bank 125 may be provided to at least partially cover an edge of thefirst electrode 120 and expose a portion of the first electrode 120.Therefore, the bank 125 may solve a problem in which light emittingefficiency is deteriorated due to concentration of a current on an endof the first electrode 120.

The bank 125 may define a light emission area EA of each of thesubpixels FSP1, FSP2, FSP3 and FSP4. The light emission area EA of eachof the subpixels FSP1, FSP2, FSP3 and FSP4 represents an area in whichthe first electrode 120, the organic light emitting layer 130 and thesecond electrode 140 are sequentially stacked so that holes from thefirst electrode 120 and electrons from the second electrode 140 arecombined with each other in the organic light emitting layer 130 to emitlight. In this case, the area in which the bank 125 is not provided andthe first electrode 120 is exposed may become the light emission areaEA, and the other area may become a non-light emission area NEA.

The organic light emitting layer 130 may be provided over the firstelectrode 120. The organic light emitting layer 130 may include a holetransporting layer, a light emitting layer and an electron transportinglayer. In this case, when a voltage is applied to the first electrode120 and the second electrode 140, holes and electrons move to the lightemitting layer through the hole transporting layer and the electrontransporting layer, respectively, and are combined with each other inthe light emitting layer to emit light.

In one embodiment, the light emitting layer of the organic lightemitting layer 130 may be provided for each of the first subpixels FSP1,FSP2 and FSP3. For example, a red light emitting layer for emitting redlight may be provided in the first subpixel FSP1, a green light emittinglayer for emitting green light may be provided in the second subpixelFSP2, and a blue light emitting layer for emitting blue light may beprovided in the third subpixel FSP3.

In another embodiment, the organic light emitting layer 130 may be acommon layer commonly provided in the subpixels FSP1, FSP2 and FSP3. Inthis case, the light emitting layer may be a white light emitting layerfor emitting white light.

The second electrode 140 may be provided over the organic light emittinglayer 130 and the bank 125. The second electrode 140 may be provided inthe non-transmissive area NTA (not shown). The second electrode 140 maybe a common layer that is commonly provided in the subpixels FSP1, FSP2and FSP3 to apply the same voltage to the subpixels. The secondelectrode 140 may include a transparent conductive material (TCO) suchas ITO and IZO, which may transmit light, or a semi-transmissiveconductive material such as magnesium (Mg), silver (Ag) or an alloy ofmagnesium (Mg) and silver (Ag). When the second electrode 140 includes asemi-transmissive conductive material, light emitting efficiency may beincreased by a micro cavity.

An encapsulation layer 150 may be provided over the light emittingelements. The encapsulation layer 150 may be provided over the secondelectrode 140 to cover the second electrode 140. The encapsulation layer150 serves to prevent oxygen or moisture from being permeated into theorganic light emitting layer 130 and the second electrode 140. To thisend, the encapsulation layer 150 may include at least one inorganiclayer and at least one organic layer.

Although not shown in FIGS. 4 and 5 , a capping layer may beadditionally provided between the second electrode 140 and theencapsulation layer 150.

The first substrate 111 and a second substrate 112, in which theencapsulation layer 150 is provided, may be bonded to each other by aseparate adhesive layer 160. The adhesive layer 160 may be an opticallyclear resin layer (OCR) or an optically clear adhesive film (OCA).

Referring back to FIG. 3 , the second display area DA2 is disposed tooverlap an area SA in which the optical sensor 300 is disposed. Thesecond display area DA2 may include a transmissive area TA and anon-transmissive area NTA. The transmissive area TA is an area throughwhich most of the light incident from the outside passes, and thenon-transmissive area NTA may be an area through which most of theincident light does not pass. External light may be incident on theoptical sensor 300, which is positioned on the rear surface of thedisplay panel 100, through the transmissive areas TA.

A plurality of second pixels SP may be provided in the second displayarea DA2. The second pixels SP are provided in the non-transmissive areaNTA disposed between the transmissive areas TA to emit predeterminedlight, thereby displaying an image. The light emission area EA maycorrespond to an area, which emits light, in the second pixel SP.

Each of the plurality of second pixels SP may include a plurality ofsecond subpixels SSP. The plurality of second subpixels SSP may includea first color subpixel SSP1, a second color subpixel SSP2 and a thirdcolor subpixel SSP3. The first color subpixel SSP1 may emit red light,the second color subpixel SSP2 may emit green light, and the third colorsubpixel SSP3 may emit blue light, but they are not limited thereto.Each of the second pixels SP may further include a fourth color subpixelSSP4 that emits white light. Various modifications may be made in thearrangement order of the second subpixels SSP without limitation to thatshown in FIG. 3 .

A circuit element, which includes a capacitor, a thin film transistorand the like, and a light emitting element may be provided in each ofthe first subpixel SSP1, the second subpixel SSP2 and the third subpixelSSP3. The thin film transistor may include a switching transistor, asensing transistor, and a driving transistor T.

Since the transistor T of the second subpixel SSP is substantially thesame as the transistor T of the first subpixel FSP, its detaileddescription will be omitted. In addition, since the light emittingelement of the second subpixel SSP substantially has the same elementsas those of the first subpixel FSP, its detailed description will beomitted. Hereinafter, differences from the first subpixel FSP will bedescribed in detail.

The light emitting element of each of the second subpixels SSP may bedisposed between the plurality of transmissive areas TA. In detail, thefirst electrode 120 and the organic light emitting layer 130 of thelight emitting element may be provided to be patterned for each of thesecond subpixels SSP1, SSP2, SSP3 and SSP4 between the plurality oftransmissive areas TA. That is, the first electrode 120 and the organiclight emitting layer 130 of the light emitting element may not beprovided in the plurality of transmissive areas TA.

Meanwhile, the second electrode 140 of the light emitting element may beprovided in the non-transmissive area NTA, and may not be provided inthe plurality of transmissive areas TA, but is not limited thereto. Whenthe second electrode 140 is made of a transparent metal material capableof transmitting light, the second electrode 140 may be also provided inthe transmissive area TA.

In the display panel 100 according to one embodiment of the presentdisclosure, since the first electrode 120, the organic light emittinglayer 130 and the second electrode 140 of the light emitting element aswell as the transistor T are not provided in the plurality oftransmissive areas TA as described above, light loss may be avoided bythese elements, whereby light transmittance of the transmissive area TAmay be improved.

As described above, the display panel 100 according to one embodiment ofthe present disclosure may include a plurality of transmissive areas TAin an area SA overlapped with the optical sensor 300. Therefore, theoptical sensor 300 positioned over the rear surface of the display panel100 may measure external light L passing through the transmissive areaTA.

Meanwhile, the display panel 100 according to one embodiment of thepresent disclosure may also include a plurality of second pixels SP aswell as a plurality of transmissive areas TA in the area SA overlappedwith the optical sensor 300. Therefore, in the display panel 100according to one embodiment of the present disclosure, an image may bedisplayed in the area SA overlapped with the optical sensor 300, so thatthe area SA overlapped with the optical sensor 300 may not be recognizedby a user.

However, since the area in which the plurality of second pixels SP areprovided corresponds to the non-transmissive area NTA having low lighttransmittance, the external light may not be transmitted in the area inwhich the plurality of second pixels SP are provided. Therefore, theoptical sensor 300 positioned over the rear surface of the display panel100 does not measure the external light through the area in which theplurality of second pixels SP are provided.

When the optical sensor 300 is a camera, the image photographed by theoptical sensor 300 includes a degradation area in which a luminancevalue is lower than a reference luminance value by the plurality ofsecond pixels SP, whereby resolution can be remarkably reduced. Forexample, the plurality of second pixels SP and the plurality oftransmissive areas TA may be disposed in the area SA overlapping withthe optical sensor 300 in one-to-one basis. In this case, since only 50%of the area SA overlapped with the optical sensor 300 becomes thetransmissive area TA, resolution of the image photographed by theoptical sensor 300 may be remarkably reduced. When a ratio of the areain which the plurality of second pixels SP are disposed in the area SAoverlapped with the optical sensor 300 is increased, resolution of theimage photographed by the optical sensor 300 may be smaller than 50%.Therefore, image quality of the optical sensor 300 may be remarkablyreduced.

In the display device 10 according to one embodiment of the presentdisclosure, the display panel 100 may move based on the operation of theoptical sensor 300, whereby the position of the area SA overlapped withthe optical sensor 300 may be changed. Therefore, the position of theplurality of transmissive areas TA disposed over the optical sensor 300may be changed.

Hereinafter, an operation relation of the optical sensor 300, thedisplay panel 100 and the roller portion 200 will be described in detailwith reference to FIGS. 6 to 12 .

FIG. 6 is a schematic block view illustrating elements of a displaydevice according to one embodiment of the present disclosure, FIG. 7 isa schematic view illustrating an example of a plurality of transmissiveareas disposed in an area overlapped with an optical sensor at aphotographing timing of a first frame image, and FIG. 8 is a schematicview illustrating an example of a plurality of transmissive areasdisposed in an area overlapped with an optical sensor at a photographingtiming of a second frame image. FIG. 9 is a view illustrating an examplein which a plurality of frame images are synthesized when aphotographing period of an optical sensor and a rotational period of aroller are the same as each other, and FIG. 10 is a view illustrating anexample in which a plurality of frame images are synthesized when aphotographing period of an optical sensor and a rotational period of aroller are different from each other. FIG. 11 is a view illustrating anexample of an image displayed on a display panel when the display panelmoves upward or downward, and FIG. 12 is a timing view illustrating atiming of a gate start signal when a display panel moves upward ordownward.

Referring to FIGS. 6 to 12 , the display device 10 according to oneembodiment of the present disclosure includes a display panel 100, aroller portion 200, an optical sensor 300, a driving controller 700 andan image processor 800.

Since the display panel 100, the roller portion 200 and the opticalsensor 300 are substantially the same as the display panel 100, theroller portion 200 and the optical sensor 300 described above, theirdetailed description will be omitted.

The driving controller 700 may control the operation of the displaypanel 100, the roller portion 200 and the optical sensor 300. Morespecifically, the driving controller 700 may control the roller of theroller portion 200 to rotate forward or backward based on the operationof the optical sensor 300. The driving controller 700 may control theroller of the roller portion 200 to rotate forward or backward based onthe photographing timing of the optical sensor 300.

The optical sensor 300 may acquire a plurality of frame images bycontinuously photographing images in accordance with an operationsignal. The plurality of frame images obtained by the optical sensor 300may be synthesized by the image processor 800 to generate one image.

The driving controller 700 may move the display panel 100 by rotatingthe roller of the roller portion 200 between photographing timings ofthe plurality of frame images. For example, the optical sensor 300 mayacquire a first frame image and a second frame image, which arecontinuous. The roller of the roller portion 200 may rotate forward orbackward between the photographing timing of the first frame image andthe photographing timing of the second frame image under the control ofthe driving controller 700.

The display panel 100 may move upward while winding when the roller isrotated forward. In addition, the display panel 100 may move downwardwhile unwinding when the roller is rotated backward. At this time, thedisplay panel 100 may move as much as a plurality of pixel pitches. Forexample, the display panel 100 may move as much as four pixel pitches.As the display panel 100 moves upward or downward as much as a pluralityof pixel pitches, the position of the display panel 100 that overlapsthe optical sensor 300 may be changed.

In detail, the optical sensor 300 may acquire the first frame image overthe rear surface of the display panel 100 shown in FIG. 7 . When theoptical sensor 300 acquires the first frame image, the drivingcontroller 700 may control the roller of the roller portion 200 torotate forward. Therefore, as shown in FIG. 8 , the display panel 100may move upward as much as a pixel pitch over the optical sensor. As thedisplay panel 100 moves upward, the position of the plurality oftransmissive areas TA may vary within the area SA overlapped with theoptical sensor 300. When the display panel 100 moves, the optical sensor300 may acquire the second frame image under the control of the drivingcontroller 700.

The display panel 100 moves in accordance with rotation of the rollerbetween the photographing timing of the first frame image and thephotographing timing of the second frame image, so that the position ofthe plurality of transmissive areas TA may be different within the areaSA overlapped with the optical sensor 300. Therefore, in the opticalsensor 300, the area on which external light is incident at thephotographing timing of the first frame image and the area on whichexternal light is incident at the photographing timing of the secondframe image may be different from each other.

For example, external light may be incident on an area, on which theexternal light is not incident by the second pixels SP at thephotographing timing of the first frame image, by transmitting throughthe transmissive area TA at the photographing timing of the second frameimage. Therefore, the first frame image and the second frame image maybe different from each other in the position of the degradation areawhere the luminance value is lower than the reference luminance value.

Meanwhile, the driving controller 700 may control the roller of theroller portion 200 to repeat forward rotation and backward rotation.More specifically, the optical sensor 300 may continuously acquire firstto fourth frame images. The driving controller 700 may control theroller of the roller portion 200 to rotate forward between thephotographing timing of the first frame image and the photographingtiming of the second frame image. Therefore, the display panel 100 maymove upward while winding. In addition, the driving controller 700 maycontrol the roller of the roller portion 200 to rotate backward betweenthe photographing timing of the second frame image and a photographingtiming of a third frame image. Therefore, the display panel 100 may movedownward to return to its original state while unwinding. In addition,the driving controller 700 may control the roller of the roller portion200 to rotate forward between the photographing timing of the thirdframe image and a photographing timing of the fourth frame. Therefore,the display panel 100 may move upward while winding.

The driving controller 700 may determine a rotational period of theroller of the roller portion 200 based on the photographing period ofthe optical sensor. In one embodiment, the driving controller 700 maycontrol the roller of the roller portion 200 to rotate with the sameperiod as the photographing period of the optical sensor 300. In detail,as shown in FIG. 9 , the driving controller 700 may control the roller Rof the roller portion 200 to rotate whenever one frame image isacquired. For example, the optical sensor 300 may acquire 60 frameimages per one second. The driving controller 700 may control the rollerR of the roller portion 200 to rotate 60 times per one second.

In another embodiment, the driving controller 700 may control the rollerof the roller portion 200 to rotate with a period longer than thephotographing period of the optical sensor 300. In detail, as shown inFIG. 10 , the driving controller 700 may control the roller R of theroller portion 200 to rotate whenever a plurality of frame images areacquired. For example, the optical sensor 300 may acquire 60 frameimages per one second. The driving controller 700 may control the rollerR of the roller portion 200 to rotate whenever two frame images areacquired. That is, the driving controller 700 may control the roller Rof the roller portion 200 to rotate 30 times per one second.

The image processor 800 may synthesize the plurality of frame imagesacquired by the optical sensor 300 to generate one image. The imageprocessor 800 may synthesize a plurality of frame images differentlydepending on the rotational period of the roller of the roller portion200.

When the rotational period of the roller R of the roller portion 200 isthe same as the photographing period of the optical sensor 300, theimage processor 800 may synthesize an odd-numbered frame image and aneven-numbered frame image, which are continuous. Referring to FIG. 9 ,the image processor 800 may synthesize a first frame image OI1 and asecond frame image OI2 to generate a first composite image CI1. At thistime, the generated first composite image CI1 is generated bysynthesizing two frame images OI1 and OI2 that are different from eachother in the positions of the degradation area ‘a’, and may correspondto an image with transmittance more improved than that of the two frameimages OI1 and OI2.

In addition, the image processor 800 may synthesize the second frameimage OI2 and a third frame image OI3 to generate a second compositeimage CI2. At this time, the generated second composite image CI2 isgenerated by synthesizing two frame images OI3 and O14 that aredifferent from each other in the positions of the degradation area ‘a’,and may correspond to an image with transmittance more improved thanthat of the two frame images OI3 and O14. The image processor 800 maygenerate M number of composite images CI1, CI2, . . . , CIm withimproved transmittance based on N number of frame images OI1, OI2, . . ., OIn. In this case, M may correspond to N−1. The image processor 800may again synthesize the plurality of composite images CI1, CI2, . . . ,CIm to generate one final image FI.

Meanwhile, when the rotational period of the roller R of the rollerportion 200 is longer than the photographing period of the opticalsensor 300, two frame images continuous with rotation of the roller R ofthe roller 200 therebetween may be synthesized. Referring to FIG. 10 ,the roller R of the roller portion 200 may rotate whenever two frameimages are acquired. In this case, the image processor 800 maysynthesize the second frame image OI2 and the third frame image OI3continuous with rotation of the roller R therebetween to generate afirst composite image CI1. At this time, the generated first compositeimage CI1 is generated by synthesizing two frame images OI2 and OI3 thatare different from each other in the positions of the degradation area‘a’, and may correspond to an image with transmittance more improvedthan that of the two frame images OI2 and OI3.

In addition, the image processor 800 may synthesize the fourth frameimage O14 and a fifth frame image O15, which are continuous withrotation of the roller R therebetween, to generate a second compositeimage CI2. At this time, the generated second composite image CI2 isgenerated by synthesizing two frame images O14 and O15 that aredifferent from each other in the positions of the degradation area ‘a’,and may correspond to an image with transmittance more improved thanthat of the two frame images O14 and O15. The image processor 800 maygenerate M number of composite images CI1, CI2, . . . , CIm withimproved transmittance based on N number of frame images OI1, OI2, . . ., OIn. In this case, M may correspond to (N−1)/2. The image processor800 may again synthesize the plurality of composite images CI1, CI2, . .. , CIm to generate one final image FI.

Meanwhile, the driving controller 700 may control the image displayed onthe display panel 100 to be shifted based on the operation of the rollerportion 200. The driving controller 700 may control the roller of theroller portion 200 to rotate forward or backward, thereby moving thedisplay panel 100 upward or downward. The driving controller 700 maycontrol the display panel 100 to shift the image displayed on thedisplay panel 100 as much as movement of the display panel 100 such thata user does not recognize the movement of the display panel 100.

The driving controller 700 may shift the image displayed on the displaypanel 100 by controlling a timing of a gate start signal Vst among gatecontrol signals for controlling the gate driver. For example, the gatestart signal Vst may be generally input to the gate driver at apredetermined period as shown in FIG. 12 , part (a). The gate driver maygenerate gate signals in accordance with the gate start signal Vst andoutput the gate signals to the gate lines.

As shown in FIG. 11 , part (b), the roller of the roller portion 200rotates forward, so that the display panel 100 may move upward as muchas a plurality of pixel pitches, for example, four pixel pitches. Inthis case, the gate start signal Vst may move to a left side as much asa timing of a fourth horizontal line 4H as shown in FIG. 12 , part (b).Further, when the display panel 100 moves downward by backward rotationof the roller of the roller portion 200 and then returns to its originalstate, the gate start signal Vst may move to a right side as much as atiming of the fourth horizontal line 4H.

As shown in FIG. 11 , part (c), the roller of the roller portion 200rotates backward, so that the display panel 100 may move downward asmuch as a plurality of pixel pitches, for example, four pixel pitches.In this case, the gate start signal Vst may move to the right side asmuch as a timing of a fourth horizontal line 4H as shown in FIG. 12 ,part (c). Further, when the display panel 100 moves upward by forwardrotation of the roller of the roller portion 200 and then returns to itsoriginal state, the gate start signal Vst may move to the left side asmuch as a timing of the fourth horizontal line 4H.

As described above, as shown in FIG. 11 , the display panel 100 mayshift up or down the displayed image even though the display panel 100moves upward as much as a plurality of pixel pitches by forward rotationof the roller of the roller portion 200 or moves downward as much as aplurality of pixel pitches by backward rotation of the roller of theroller portion 200. Therefore, since the image displayed on the displaypanel 100 may not move up or down, the movement of the display panel 100may not be recognized by the user.

The display device 10 according to one embodiment of the presentdisclosure is characterized in that the optical sensor 300 acquires aplurality of frame images while the display panel 100 disposed thereonis moving. In the display device 10 according to one embodiment of thepresent disclosure, as the display panel 100 moves, the position of theplurality of transmissive areas TA disposed on the optical sensor 300may vary. Therefore, the frame image acquired prior to the movement ofthe display panel 100 and the frame image acquired after the movement ofthe display panel 100 may be different from each other in the positionof the degradation area. The display device 10 according to oneembodiment of the present disclosure may improve resolution and qualityof an image by synthesizing frame images that are different from eachother in the position of the degradation area.

In addition, the display device 10 according to one embodiment of thepresent disclosure is characterized in that the display panel 100 movesinstead of the optical sensor 300. As one of methods of improvingresolution of an image, it may be considered to acquire a plurality offrame images while the optical sensor 300 is moving, unlike the presentdisclosure. However, the plurality of frame images acquired while theoptical sensor 300 is moving may be different from each other in theacquired area depending on the position of the optical sensor 300. Thatis, optical axes of the plurality of frame images may be different fromeach other.

As described above, in order to synthesize a plurality of frame imageshaving different optical axes, there is a need for a complexpre-processing process, such as stereo image composition, for matchingoptical axes of the plurality of frame images and extracting overlapareas. In addition, since image composition is performed in such amanner that only overlap areas are extracted from the plurality of frameimages, resolution is deteriorated.

On the other hand, when a plurality of frame images are acquired whilethe display panel 100 is moving like the present disclosure, since theoptical sensor 300 does not move, the optical axes of the acquiredplurality of frame images may be the same. Therefore, the display device10 according to one embodiment of the present disclosure does notrequire a complex pre-processing process such as matching the opticalaxes of the plurality of frame images, and may simply extract reliablepixel data from each of the frame images to generate a composite imagebased on the extracted pixel data. That is, in the display device 10according to one embodiment of the present disclosure, since the imagecomposite process is simple, fast image processing may be performed.Furthermore, since all areas of the plurality of frame images are thesame, deterioration of resolution may not occur during imagecomposition.

According to the present disclosure, the following advantageous effectsmay be obtained.

In the present disclosure, the optical sensor may acquire the pluralityof frame images and synthesize the acquired frame images while thedisplay panel disposed thereon is moving, whereby resolution and qualityof the image may be improved.

Also, in the present disclosure, the images may be synthesized withoutdeterioration of resolution, and the image composite process is simple,whereby fast image processing may be performed.

In addition, in the present disclosure, the display image is shiftedtogether when the display panel moves, so that the movement of thedisplay panel may not be easily recognized to the user.

It will be apparent to those skilled in the art that the presentdisclosure described above is not limited by the above-describedembodiments and the accompanying drawings and that varioussubstitutions, modifications and variations can be made in the presentdisclosure without departing from the spirit or scope of thedisclosures. Consequently, the scope of the present disclosure isdefined by the accompanying claims and it is intended that allvariations or modifications derived from the meaning, scope andequivalent concept of the claims fall within the scope of the presentdisclosure.

What is claimed is:
 1. A display device comprising: a display panelincluding a first display area and a second display area in which aplurality of transmissive areas are disposed; a roller portion coupledto the display panel at one side of the display panel, including aroller that makes the display panel move when rotating; an opticalsensor disposed to overlap the second display area of the display panel;and a driving controller controlling the roller to rotate forward orbackward to move the display panel based on an operation of the opticalsensor, wherein when the display panel moves, the optical sensoracquires a plurality of images for synthetization.
 2. The display deviceof claim 1, wherein the plurality of images include a first frame imageand a second frame image, which are continuous, and the roller of theroller portion rotates forward or backward between a photographingtiming of the first frame image and a photographing timing of the secondframe image under the control of the driving controller.
 3. The displaydevice of claim 1, wherein the roller of the roller portion rotatesforward or backward under the control of the driving controller to movethe display panel as much as a plurality of pixel pitches.
 4. Thedisplay device of claim 1, wherein the driving controller controls theoptical sensor to acquire frame images at a first period and controlsthe roller portion to move the display panel at a second period.
 5. Thedisplay device of claim 4, wherein the second period is the same as thefirst period.
 6. The display device of claim 4, wherein the secondperiod is longer than the first period.
 7. The display device of claim1, wherein the driving controller controls an image displayed on thedisplay panel to be shifted based on an operation of the roller portion.8. The display device of claim 7, wherein the image displayed on thedisplay panel is shifted as much as pixel pitches moved by the rollerportion under the control of the driving controller.
 9. The displaydevice of claim 1, wherein the driving controller controls the roller torepeat forward rotation and backward rotation.
 10. The display device ofclaim 1, wherein the second display area includes a plurality of pixelareas and the plurality of transmissive areas provided between theplurality of pixel areas.
 11. The display device of claim 1, furthercomprising an image processor synthesizing a plurality of frame imagesacquired by the optical sensor.
 12. A display device comprising: anoptical sensor acquiring a first frame image and a second frame imagecontinuously for synthetization in accordance with an operation signal;and a display panel including a first display area and a second displayarea overlapped with the optical sensor in which a plurality oftransmissive areas are disposed, wherein the display panel has differentpositions overlapped with the optical sensor at a photographing timingof the first frame image and a photographing timing of the second frameimage.
 13. The display device of claim 12, wherein the plurality oftransmissive areas of the display panel are different in positions atthe photographing timing of the first frame image and the photographingtiming of the second frame image.
 14. The display device of claim 12,wherein the display panel moves over the optical sensor between thephotographing timing of the first frame image and the photographingtiming of the second frame image.
 15. The display device of claim 14,wherein an image displayed on the display panel is shifted as much asmovement of the display panel.
 16. The display device of claim 12,further comprising an image processor generating a composite image bysynthesizing the first frame image and the second frame image.